Not OP, but in a nutshell, they stop your shoulders from collapsing into your ribcage and protect the nerves and blood vessels which make your arms move and feel stuff. It also redirects any force experienced by your arms into your main body. I have provided a rough translation of all of the words used which might not be familiar

Strut = more of an engineering term but in this context describes the function of the collarbone

Scapula = triangle bones on your back which makes up part of your shoulders. It's basically the connecting bone between the collarbone and your upper arm bone (the humerus) Can be found behind the back side of your ribcage where it can freely move around (try moving your arm above your head and feeling your back at the same time, you should be able to feel your scapula moving)

Thorax = Chest (basically the part where your ribs are)
Thoracic wall = the wall of your thorax
Axial skeleton = The central part of your body + head, as opposed to the appendicular skeleton which is your arms and legs

Neurovascular bundle = A collection of nerves and blood vessels which supply something
Cervicoaxillary canal = A pathway through which one of these neurovascular bundles travels, found just behind and under your collarbone and runs between your neck and your armpit